[BUG] Display is garbled when using agent view mode

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

When using agent view mode the display gets quickly garbled with random characters. Resizing the window only helps for a few seconds. Ctrl+L doesn't help.

<img width="899" height="474" alt="Image" src="https://github.com/user-attachments/assets/03948e6a-8d4f-4965-b09b-cf0edc511350" />

What Should Happen?

Clean text in the viewport

Error Messages/Logs

Steps to Reproduce

Open a session
Go into agent view
Create a few agents
It won't take long for the agent views to be scrambled/garbled. both in the agent view and the main session view

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

v2.1.140

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_